Manufacture of metal covered copper wires



Patented May 10, 1932 I I UNITED, STATES PATENT OFFICE GEOBG- MASJING, OF BERLIN, GERMANY, ASSIGNOIR 'IO SIEMENS & HALSKE, AK'I'IEN- GESELLSCHAFT, OF SIEMENSSTADT NEAR BERLIN, GERMANY, A CORPORATION OF GERMANY MANUFACTURE OF METAL COVERED COPPER WIRES No Drawing. Application filed April 6, 1929,Seria1 No. 358,245, and'in Germany March 3, 1928.

My invention relates to improvements in the manufacture of metal covered copper wires.

It is well known that for the manufacture 6 of Krarup wires copper wires are covered I with magnetic materials, such as iron or iron alloys. In order to restore the magnetic properties of the covering wire which have deteriorated during its application to the cop- 10 per wire, Krarup wire is subsequently heated to about red heat. It has been observed that the copper wire becomes brittle if a heatmg temperature of 1000 F. (550 is exceeded. If, on the other hand the heating-tem- 15 perature is confined to 1000 F. (550 0.), it is impossible to set up the most favorable magnetic properties in the iron covering,

wrapping or braiding.

Extensive researches and tests have shown that the brittleness of the copper is avoided if the copper wire is manufactured of copper deoxidized in the melted state. As a deoxidizer calcium is amongst others particularly suitable, as it does not decrease the conductivity of the copper.

I claim as my invention:

1. As a new article of commerce, a heat treated metal covered wire having a copper conductor composed of copper completely dcoxidized in the melted state.

2. As a new article of commerce, 2. heat treated metal covered wire having a copper conductor composed of copper completely deoxidized by means of calcium.

-3. As a new article of commerce, aheat treated ferret-magnetic metal covered copper wire, whose copper portion consists of copper completely deoxidized in the melted state.

4. As a new article of commerce, a heat treated iron covered copper wire, whose copper portion consists of copper completely de- -oxidized in the melted state.

In testimony whereof I afiix my signature.

GEORG MASING.

DISCLAIMER r -'1,85'7,600.Gecrg Musing, Berlin, Germany. MANUFACTURE OF METAL COVERED COPPER WIRES. Patentdated May 10, L932. Disclaimer'filed July 10,

I 1935 by the assignee, sieme ns &: Halske, Aktiengesellschafi. Hereby enter this disclaimer to that part of the claim in 'said specification which is in the following words, to wit:

-- 1. As anew article of commerce, a heat treated metal covered wire having a copper conductor composed of copper completely deoxidized in the melted state.

3. As a new article of commerce, a heat treated ferromagnetic metal covered copper wire, whose copper portion consists of copper completely deoxidized in the melted state.

' '4. As a new' article of commerce, a heat treatediron covered copper-wire, whose copper portion consists of copper completely deoxidized in the melted state.

[Oficial Gazette July 1935,] 

